Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2016 $ / shares shares	Dec. 31, 2017 USD ($) vote / shares $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) shares	Sep. 30, 2017 USD ($)	Dec. 31, 2014 shares
Common Stock And Preferred Stock [Line Items]
Common stock, shares authorized | shares		190,000,000	190,000,000
Common stock, par value | $ / shares		$ 0.001	$ 0.001
Common stock, shares issued | shares		19,920,805	19,686,917
Common stock, shares outstanding | shares		17,914,599	17,690,611
Common stock, number of vote per share | vote / shares		1
Stock Repurchase Program, Authorized Amount					$ 125,000
Treasury Stock, Shares, Acquired | shares		513,801
Treasury Stock Acquired, Average Cost Per Share | $ / shares	$ 68.00	$ 108.87
Treasury Stock, Value, Acquired, Cost Method Excluding Commissions		$ 55,935
Payments for Repurchase of Common Stock		(55,123)	$ (23,800)	$ 0
Secondary Offering Shares Sold By Selling Stockholders | shares	2,278,031
Treasury Stock, Value, Acquired, Cost Method		55,947	23,800
Secondary Offering Underwriting Fees		0	$ 5,900	$ 0
Professional Fees		600
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 45,300
Common Stock [Member]
Common Stock And Preferred Stock [Line Items]
Common stock, shares outstanding | shares		17,914,599	17,690,611	17,458,945		17,039,328
Treasury Stock, Shares, Acquired | shares		513,801	350,000
Treasury Stock, Value, Acquired, Cost Method		$ 1
Cooper Standard Holdings Inc Equity [Member]
Common Stock And Preferred Stock [Line Items]
Treasury Stock, Value, Acquired, Cost Method			$ 23,800